Comment by andix

Special keyboards for one-handed typing are probably very expensive because of two reasons. First the small market, not a lot of potential customers, a lot of development costs and high per-unit production costs. And second because they are often paid for by insurance or a public program to bring people with disabilities to the workplace. It's a bargain for insurance to buy a keyboard for 1000$ and enable a person to do their job, instead of paying for decades of sick leave.